Psyllaephagus pilosus

Noyes, 1988

Bluegum Psyllid Encyrtid Wasp

Psyllaephagus pilosus is an Australian encyrtid introduced as a agent for the eucalyptus psyllid Ctenarytaina eucalypti. It has been successfully released and established in Ireland, Chile, and other regions outside its native range. The is known for rapid establishment and high rates, reaching nearly 100% in some release sites within months of introduction.

Pronunciation

How to pronounce Psyllaephagus pilosus: /sɪˈliːfəɡəs paɪˈloʊsəs/

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Identification

As an encyrtid , P. pilosus is a minute , likely under 2 mm in length based on typical Psyllaephagus . Specific diagnostic features distinguishing it from are not documented in available sources. The name 'pilosus' (hairy) suggests a relatively setose body compared to related species.

Habitat

Eucalyptus plantations and areas with eucalyptus foliage where the Ctenarytaina eucalypti occurs.

Distribution

Native to Australia (Australian Capital Territory, New South Wales). Introduced and established in Ireland (Co. Kerry and multiple sites), Chile (V Region), California (USA), England, and Isle of Man. Natural has been documented up to 70 km from release points within a single season.

Seasonality

In Ireland, first parasitized nymphs observed 26 days after May release; new emerged after 49 days. Second generation adults appeared in late August, with peak in late October. The successfully overwinters in temperate climates once established.

Host Associations

Life Cycle

with development within nymphs. time approximately 7 weeks under Irish conditions (May-October observations). Multiple generations per year possible in favorable climates.

Behavior

Rapid from release points, with establishment at distances up to 70 km within one season. seek out nymphs on eucalyptus foliage for oviposition.

Ecological Role

agent of the eucalyptus psyllid pest Ctenarytaina eucalypti. Capable of achieving high rates (>90%) and suppressing in plantation settings.

Human Relevance

Intentionally introduced agent for managing eucalyptus psyllid in commercial eucalyptus foliage plantations. Demonstrated success in Ireland and Chile as an alternative to chemical control.

Similar Taxa

  • Psyllaephagus spp.Other congeneric are of psyllids; identification to species level requires examination of minute morphological characters not visible without microscopy.
  • Torymus spp.Also of nymphs in galls; belong to different (Torymidae) with distinct morphological features.

More Details

Introduction History

The Irish introduction in 1998 used collected from a previous release site in France, indicating secondary redistribution from an earlier introduction outside the native range. This demonstrates the ' adaptability to novel environments.

Establishment Requirements

Successful establishment requires release timing that allows at least two before winter. Late-season arrivals with insufficient time for buildup before winter may fail to establish, as observed at two Irish sites in 1998.

Tags

Sources and further reading